... High heating speed. 4.IGBT module Complete Induction Hardening Equipment For Concrete Pipe Inner Wall Hardening :No.ConfigurationQuantityAdvantages and necessityTechnique ... a key operation is completed; centralized control, easy operation, not easy mistakes, product qualification rate is high. Can be ... 20%, the processing power per ton of steel is not higher than 300 degrees small size, easy to move, ...